[PATCH 13/31] timer: Remove meaningless .data/.function assignments

[PATCH 13/31] timer: Remove meaningless .data/.function assignments

[Kees Cook]

Several timer users needlessly reset their .function/.data fields during
their timer callback, but nothing else changes them. Some users do not
use their .data field at all. Each instance is removed here.

Cc: Krzysztof Halasa <khc@pm.waw.pl>
Cc: Aditya Shankar <aditya.shankar@microchip.com>
Cc: Ganesh Krishna <ganesh.krishna@microchip.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: netdev@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/block/amiflop.c                           | 3 +--
 drivers/net/wan/hdlc_cisco.c                      | 2 --
 drivers/net/wan/hdlc_fr.c                         | 2 --
 drivers/staging/wilc1000/wilc_wfi_cfgoperations.c | 4 +---
 4 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index c4b1cba27178..6680d75bc857 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -323,7 +323,7 @@ static void fd_deselect (int drive)
 
 }
 
-static void motor_on_callback(unsigned long nr)
+static void motor_on_callback(unsigned long ignored)
 {
 	if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
 		complete_all(&motor_on_completion);
@@ -344,7 +344,6 @@ static int fd_motor_on(int nr)
 		fd_select(nr);
 
 		reinit_completion(&motor_on_completion);
-		motor_on_timer.data = nr;
 		mod_timer(&motor_on_timer, jiffies + HZ/2);
 
 		on_attempts = 10;
diff --git a/drivers/net/wan/hdlc_cisco.c b/drivers/net/wan/hdlc_cisco.c
index c696d42f4502..6c98d85f2773 100644
--- a/drivers/net/wan/hdlc_cisco.c
+++ b/drivers/net/wan/hdlc_cisco.c
@@ -276,8 +276,6 @@ static void cisco_timer(unsigned long arg)
 	spin_unlock(&st->lock);
 
 	st->timer.expires = jiffies + st->settings.interval * HZ;
-	st->timer.function = cisco_timer;
-	st->timer.data = arg;
 	add_timer(&st->timer);
 }
 
diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
index de42faca076a..7da2424c28a4 100644
--- a/drivers/net/wan/hdlc_fr.c
+++ b/drivers/net/wan/hdlc_fr.c
@@ -644,8 +644,6 @@ static void fr_timer(unsigned long arg)
 			state(hdlc)->settings.t391 * HZ;
 	}
 
-	state(hdlc)->timer.function = fr_timer;
-	state(hdlc)->timer.data = arg;
 	add_timer(&state(hdlc)->timer);
 }
 
diff --git a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
index 68fd5b3b8b2d..2fca2b017093 100644
--- a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
+++ b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
@@ -275,7 +275,7 @@ static void update_scan_time(void)
 		last_scanned_shadow[i].time_scan = jiffies;
 }
 
-static void remove_network_from_shadow(unsigned long arg)
+static void remove_network_from_shadow(unsigned long unused)
 {
 	unsigned long now = jiffies;
 	int i, j;
@@ -296,7 +296,6 @@ static void remove_network_from_shadow(unsigned long arg)
 	}
 
 	if (last_scanned_cnt != 0) {
-		hAgingTimer.data = arg;
 		mod_timer(&hAgingTimer, jiffies + msecs_to_jiffies(AGING_TIME));
 	}
 }
@@ -313,7 +312,6 @@ static int is_network_in_shadow(struct network_info *pstrNetworkInfo,
 	int i;
 
 	if (last_scanned_cnt == 0) {
-		hAgingTimer.data = (unsigned long)user_void;
 		mod_timer(&hAgingTimer, jiffies + msecs_to_jiffies(AGING_TIME));
 		state = -1;
 	} else {
-- 
2.7.4

Re: [PATCH 13/31] timer: Remove meaningless .data/.function assignments

[Greg Kroah-Hartman]

On Thu, Aug 31, 2017 at 04:29:25PM -0700, Kees Cook wrote:
> Several timer users needlessly reset their .function/.data fields during
> their timer callback, but nothing else changes them. Some users do not
> use their .data field at all. Each instance is removed here.
> 
> Cc: Krzysztof Halasa <khc@pm.waw.pl>
> Cc: Aditya Shankar <aditya.shankar@microchip.com>
> Cc: Ganesh Krishna <ganesh.krishna@microchip.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Jens Axboe <axboe@fb.com>
> Cc: netdev@vger.kernel.org
> Cc: linux-wireless@vger.kernel.org
> Cc: devel@driverdev.osuosl.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  drivers/block/amiflop.c                           | 3 +--
>  drivers/net/wan/hdlc_cisco.c                      | 2 --
>  drivers/net/wan/hdlc_fr.c                         | 2 --
>  drivers/staging/wilc1000/wilc_wfi_cfgoperations.c | 4 +---
>  4 files changed, 2 insertions(+), 9 deletions(-)

For the staging driver:

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH 13/31] timer: Remove meaningless .data/.function assignments

[Krzysztof Halasa]

Kees Cook <keescook@chromium.org> writes:

> Several timer users needlessly reset their .function/.data fields during
> their timer callback, but nothing else changes them. Some users do not
> use their .data field at all. Each instance is removed here.

For *wan/hdlc*
Acked-by: Krzysztof Halasa <khc@pm.waw.pl>

> --- a/drivers/net/wan/hdlc_cisco.c
> +++ b/drivers/net/wan/hdlc_cisco.c
> @@ -276,8 +276,6 @@ static void cisco_timer(unsigned long arg)
>  	spin_unlock(&st->lock);
>  
>  	st->timer.expires = jiffies + st->settings.interval * HZ;
> -	st->timer.function = cisco_timer;
> -	st->timer.data = arg;
>  	add_timer(&st->timer);
>  }
>  
> diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
> index de42faca076a..7da2424c28a4 100644
> --- a/drivers/net/wan/hdlc_fr.c
> +++ b/drivers/net/wan/hdlc_fr.c
> @@ -644,8 +644,6 @@ static void fr_timer(unsigned long arg)
>  			state(hdlc)->settings.t391 * HZ;
>  	}
>  
> -	state(hdlc)->timer.function = fr_timer;
> -	state(hdlc)->timer.data = arg;
>  	add_timer(&state(hdlc)->timer);
>  }

-- 
Krzysztof Halasa

Re: [PATCH 13/31] timer: Remove meaningless .data/.function assignments

[Jens Axboe]

On 08/31/2017 05:29 PM, Kees Cook wrote:
> Several timer users needlessly reset their .function/.data fields during
> their timer callback, but nothing else changes them. Some users do not
> use their .data field at all. Each instance is removed here.

For amiflop:

Acked-by: Jens Axboe <axboe@kernel.dk>

-- 
Jens Axboe

[PATCH 19/31] timer: Remove open-coded casts for .data and .function

[Kees Cook]

This standardizes the callback and data prototypes in several places that
perform casting, in an effort to remove more open-coded .data and
.function uses in favor of setup_timer().

Cc: Samuel Ortiz <samuel@sortiz.org>
Cc: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: netdev@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/net/irda/bfin_sir.c      |  5 +++--
 drivers/scsi/ibmvscsi/ibmvfc.c   | 14 ++++++--------
 drivers/scsi/ibmvscsi/ibmvscsi.c |  8 ++++----
 3 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/net/irda/bfin_sir.c b/drivers/net/irda/bfin_sir.c
index 3151b580dbd6..c9413bd580a7 100644
--- a/drivers/net/irda/bfin_sir.c
+++ b/drivers/net/irda/bfin_sir.c
@@ -317,8 +317,9 @@ static void bfin_sir_dma_rx_chars(struct net_device *dev)
 		async_unwrap_char(dev, &self->stats, &self->rx_buff, port->rx_dma_buf.buf[i]);
 }
 
-void bfin_sir_rx_dma_timeout(struct net_device *dev)
+void bfin_sir_rx_dma_timeout(unsigned long data)
 {
+	struct net_device *dev = (struct net_device *)data;
 	struct bfin_sir_self *self = netdev_priv(dev);
 	struct bfin_sir_port *port = self->sir_port;
 	int x_pos, pos;
@@ -406,7 +407,7 @@ static int bfin_sir_startup(struct bfin_sir_port *port, struct net_device *dev)
 	enable_dma(port->rx_dma_channel);
 
 	port->rx_dma_timer.data = (unsigned long)(dev);
-	port->rx_dma_timer.function = (void *)bfin_sir_rx_dma_timeout;
+	port->rx_dma_timer.function = bfin_sir_rx_dma_timeout;
 
 #else
 
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index cc4e05be8d4a..1be20688dd1f 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -1393,8 +1393,9 @@ static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
  *
  * Called when an internally generated command times out
  **/
-static void ibmvfc_timeout(struct ibmvfc_event *evt)
+static void ibmvfc_timeout(unsigned long data)
 {
+	struct ibmvfc_event *evt = (struct ibmvfc_event *)data;
 	struct ibmvfc_host *vhost = evt->vhost;
 	dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
 	ibmvfc_reset_host(vhost);
@@ -1424,12 +1425,10 @@ static int ibmvfc_send_event(struct ibmvfc_event *evt,
 		BUG();
 
 	list_add_tail(&evt->queue, &vhost->sent);
-	init_timer(&evt->timer);
+	setup_timer(&evt->timer, ibmvfc_timeout, (unsigned long)evt);
 
 	if (timeout) {
-		evt->timer.data = (unsigned long) evt;
 		evt->timer.expires = jiffies + (timeout * HZ);
-		evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
 		add_timer(&evt->timer);
 	}
 
@@ -3696,8 +3695,9 @@ static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
  * out, reset the CRQ. When the ADISC comes back as cancelled,
  * log back into the target.
  **/
-static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
+static void ibmvfc_adisc_timeout(unsigned long data)
 {
+	struct ibmvfc_target *tgt = (struct ibmvfc_target *)data;
 	struct ibmvfc_host *vhost = tgt->vhost;
 	struct ibmvfc_event *evt;
 	struct ibmvfc_tmf *tmf;
@@ -3782,9 +3782,7 @@ static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
 	if (timer_pending(&tgt->timer))
 		mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
 	else {
-		tgt->timer.data = (unsigned long) tgt;
 		tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
-		tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
 		add_timer(&tgt->timer);
 	}
 
@@ -3916,7 +3914,7 @@ static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
 	tgt->vhost = vhost;
 	tgt->need_login = 1;
 	tgt->cancel_key = vhost->task_set++;
-	init_timer(&tgt->timer);
+	setup_timer(&tgt->timer, ibmvfc_adisc_timeout, (unsigned long)tgt);
 	kref_init(&tgt->kref);
 	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
 	spin_lock_irqsave(vhost->host->host_lock, flags);
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index da22b3665cb0..44ae85903a00 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -837,8 +837,9 @@ static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
  *
  * Called when an internally generated command times out
 */
-static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
+static void ibmvscsi_timeout(unsigned long data)
 {
+	struct srp_event_struct *evt_struct = (struct srp_event_struct *)data;
 	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 
 	dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
@@ -927,11 +928,10 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
 	 */
 	list_add_tail(&evt_struct->list, &hostdata->sent);
 
-	init_timer(&evt_struct->timer);
+	setup_timer(&evt_struct->timer, ibmvscsi_timeout,
+		    (unsigned long)evt_struct);
 	if (timeout) {
-		evt_struct->timer.data = (unsigned long) evt_struct;
 		evt_struct->timer.expires = jiffies + (timeout * HZ);
-		evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
 		add_timer(&evt_struct->timer);
 	}
 
-- 
2.7.4

Re: [PATCH 19/31] timer: Remove open-coded casts for .data and .function

[Tyrel Datwyler]

On 08/31/2017 04:29 PM, Kees Cook wrote:
> This standardizes the callback and data prototypes in several places that
> perform casting, in an effort to remove more open-coded .data and
> .function uses in favor of setup_timer().
> 
> Cc: Samuel Ortiz <samuel@sortiz.org>
> Cc: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
> Cc: netdev@vger.kernel.org
> Cc: linux-scsi@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  drivers/net/irda/bfin_sir.c      |  5 +++--
>  drivers/scsi/ibmvscsi/ibmvfc.c   | 14 ++++++--------
>  drivers/scsi/ibmvscsi/ibmvscsi.c |  8 ++++----
>  3 files changed, 13 insertions(+), 14 deletions(-)
For ibmvfc & ibmvscsi portions:

Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>

Re: [PATCH 19/31] timer: Remove open-coded casts for .data and .function

[Tyrel Datwyler]

On 08/31/2017 04:29 PM, Kees Cook wrote:
> This standardizes the callback and data prototypes in several places that
> perform casting, in an effort to remove more open-coded .data and
> .function uses in favor of setup_timer().
> 
> Cc: Samuel Ortiz <samuel@sortiz.org>
> Cc: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
> Cc: netdev@vger.kernel.org
> Cc: linux-scsi@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  drivers/net/irda/bfin_sir.c      |  5 +++--
>  drivers/scsi/ibmvscsi/ibmvfc.c   | 14 ++++++--------
>  drivers/scsi/ibmvscsi/ibmvscsi.c |  8 ++++----
>  3 files changed, 13 insertions(+), 14 deletions(-)

Resending from correct email address.

For ibmvfc & ibmvscsi portions:

Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>

[PATCH 20/31] net/core: Collapse redundant sk_timer callback data assignments

[Kees Cook]

The core sk_timer initializer can provide the common .data assignment
instead of it being set separately in users.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Andrew Hendry <andrew.hendry@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: linzhang <xiaolou4617@gmail.com>
Cc: netdev@vger.kernel.org
Cc: linux-hams@vger.kernel.org
Cc: linux-x25@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 net/core/sock.c       | 2 +-
 net/netrom/nr_timer.c | 1 -
 net/rose/rose_timer.c | 1 -
 net/x25/af_x25.c      | 1 -
 net/x25/x25_timer.c   | 1 -
 5 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index ac2a404c73eb..5281a998ab32 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2623,7 +2623,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
 	sk_init_common(sk);
 	sk->sk_send_head	=	NULL;
 
-	init_timer(&sk->sk_timer);
+	setup_timer(&sk->sk_timer, NULL, (unsigned long)sk);
 
 	sk->sk_allocation	=	GFP_KERNEL;
 	sk->sk_rcvbuf		=	sysctl_rmem_default;
diff --git a/net/netrom/nr_timer.c b/net/netrom/nr_timer.c
index 94d05806a9a2..f84ce71f1f5f 100644
--- a/net/netrom/nr_timer.c
+++ b/net/netrom/nr_timer.c
@@ -45,7 +45,6 @@ void nr_init_timers(struct sock *sk)
 	setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
 
 	/* initialized by sock_init_data */
-	sk->sk_timer.data     = (unsigned long)sk;
 	sk->sk_timer.function = &nr_heartbeat_expiry;
 }
 
diff --git a/net/rose/rose_timer.c b/net/rose/rose_timer.c
index bc5469d6d9cb..6baa415b199a 100644
--- a/net/rose/rose_timer.c
+++ b/net/rose/rose_timer.c
@@ -36,7 +36,6 @@ void rose_start_heartbeat(struct sock *sk)
 {
 	del_timer(&sk->sk_timer);
 
-	sk->sk_timer.data     = (unsigned long)sk;
 	sk->sk_timer.function = &rose_heartbeat_expiry;
 	sk->sk_timer.expires  = jiffies + 5 * HZ;
 
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 5a1a98df3499..a5ac385b9120 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -414,7 +414,6 @@ static void __x25_destroy_socket(struct sock *sk)
 		/* Defer: outstanding buffers */
 		sk->sk_timer.expires  = jiffies + 10 * HZ;
 		sk->sk_timer.function = x25_destroy_timer;
-		sk->sk_timer.data = (unsigned long)sk;
 		add_timer(&sk->sk_timer);
 	} else {
 		/* drop last reference so sock_put will free */
diff --git a/net/x25/x25_timer.c b/net/x25/x25_timer.c
index 5c5db1a36399..de5cec41d100 100644
--- a/net/x25/x25_timer.c
+++ b/net/x25/x25_timer.c
@@ -36,7 +36,6 @@ void x25_init_timers(struct sock *sk)
 	setup_timer(&x25->timer, x25_timer_expiry, (unsigned long)sk);
 
 	/* initialized by sock_init_data */
-	sk->sk_timer.data     = (unsigned long)sk;
 	sk->sk_timer.function = &x25_heartbeat_expiry;
 }
 
-- 
2.7.4

[PATCH 25/31] net/atm/mpc: Use separate static data field with with static timer

[Kees Cook]

In preparation for changing the timer callback argument to the timer
pointer, move to a separate static data variable.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Reshetova, Elena" <elena.reshetova@intel.com>
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 net/atm/mpc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/atm/mpc.c b/net/atm/mpc.c
index 5baa31b8500c..fc24a46500ae 100644
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -95,7 +95,7 @@ static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
 			       unsigned long event, void *dev);
 static void mpc_timer_refresh(void);
-static void mpc_cache_check(unsigned long checking_time);
+static void mpc_cache_check(unsigned long unused);
 
 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
 	0xaa, 0xaa, 0x03,
@@ -121,7 +121,8 @@ static struct notifier_block mpoa_notifier = {
 
 struct mpoa_client *mpcs = NULL; /* FIXME */
 static struct atm_mpoa_qos *qos_head = NULL;
-static DEFINE_TIMER(mpc_timer, NULL);
+static DEFINE_TIMER(mpc_timer, mpc_cache_check);
+static unsigned long checking_time;
 
 
 static struct mpoa_client *find_mpc_by_itfnum(int itf)
@@ -1411,12 +1412,11 @@ static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
 static void mpc_timer_refresh(void)
 {
 	mpc_timer.expires = jiffies + (MPC_P2 * HZ);
-	mpc_timer.data = mpc_timer.expires;
-	mpc_timer.function = mpc_cache_check;
+	checking_time = mpc_timer.expires;
 	add_timer(&mpc_timer);
 }
 
-static void mpc_cache_check(unsigned long checking_time)
+static void mpc_cache_check(unsigned long unused)
 {
 	struct mpoa_client *mpc = mpcs;
 	static unsigned long previous_resolving_check_time;
-- 
2.7.4

[PATCH 30/31] appletalk: Remove unneeded synchronization

[Kees Cook]

The use of del_timer_sync() will make sure a timer is not rescheduled.
As such, there is no need to add external signals to kill timers. In
preparation for switching the timer callback argument to the timer
pointer, this drops the .data argument since it doesn't serve a meaningful
purpose here.

Cc: David Howells <dhowells@redhat.com>
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/net/appletalk/ltpc.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/net/appletalk/ltpc.c b/drivers/net/appletalk/ltpc.c
index e4aa374caa4d..cc3dc9337eae 100644
--- a/drivers/net/appletalk/ltpc.c
+++ b/drivers/net/appletalk/ltpc.c
@@ -880,14 +880,10 @@ static void ltpc_poll(unsigned long l)
 		}
 		ltpc_poll_counter--;
 	}
-  
-	if (!dev)
-		return;  /* we've been downed */
 
 	/* poll 20 times per second */
 	idle(dev);
 	ltpc_timer.expires = jiffies + HZ/20;
-	
 	add_timer(&ltpc_timer);
 }
 
@@ -1252,8 +1248,6 @@ static void __exit ltpc_cleanup(void)
 	if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
 	unregister_netdev(dev_ltpc);
 
-	ltpc_timer.data = 0;  /* signal the poll routine that we're done */
-
 	del_timer_sync(&ltpc_timer);
 
 	if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
-- 
2.7.4

[PATCH 31/31] timer: Switch to testing for .function instead of .data

[Kees Cook]

In several places, .data is checked for initialization to gate early
calls to del_timer_sync(). Checking for .function is equally valid, so
switch to this in all callers.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Len Brown <len.brown@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
Cc: Dennis Dalessandro <dennis.dalessandro@intel.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Sean Hefty <sean.hefty@intel.com>
Cc: Hal Rosenstock <hal.rosenstock@gmail.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-rdma@vger.kernel.org
Cc: linux-input@vger.kernel.org
Cc: intel-wired-lan@lists.osuosl.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/base/power/wakeup.c                 |  3 +--
 drivers/infiniband/hw/hfi1/chip.c           |  6 ++----
 drivers/infiniband/hw/hfi1/init.c           |  2 +-
 drivers/infiniband/hw/qib/qib_iba7220.c     |  2 +-
 drivers/infiniband/hw/qib/qib_iba7322.c     |  2 +-
 drivers/infiniband/hw/qib/qib_init.c        | 14 +++++---------
 drivers/infiniband/hw/qib/qib_mad.c         |  2 +-
 drivers/input/input.c                       |  5 ++---
 drivers/net/ethernet/intel/i40e/i40e_main.c |  2 +-
 9 files changed, 15 insertions(+), 23 deletions(-)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 144e6d8fafc8..79a3c1b204af 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -479,8 +479,7 @@ static bool wakeup_source_not_registered(struct wakeup_source *ws)
 	 * Use timer struct to check if the given source is initialized
 	 * by wakeup_source_add.
 	 */
-	return ws->timer.function != pm_wakeup_timer_fn ||
-		   ws->timer.data != (unsigned long)ws;
+	return ws->timer.function != pm_wakeup_timer_fn;
 }
 
 /*
diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index 94b54850ec75..53a6596cd7d6 100644
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -5513,9 +5513,8 @@ static int init_rcverr(struct hfi1_devdata *dd)
 
 static void free_rcverr(struct hfi1_devdata *dd)
 {
-	if (dd->rcverr_timer.data)
+	if (dd->rcverr_timer.function)
 		del_timer_sync(&dd->rcverr_timer);
-	dd->rcverr_timer.data = 0;
 }
 
 static void handle_rxe_err(struct hfi1_devdata *dd, u32 unused, u64 reg)
@@ -11992,9 +11991,8 @@ static void free_cntrs(struct hfi1_devdata *dd)
 	struct hfi1_pportdata *ppd;
 	int i;
 
-	if (dd->synth_stats_timer.data)
+	if (dd->synth_stats_timer.function)
 		del_timer_sync(&dd->synth_stats_timer);
-	dd->synth_stats_timer.data = 0;
 	ppd = (struct hfi1_pportdata *)(dd + 1);
 	for (i = 0; i < dd->num_pports; i++, ppd++) {
 		kfree(ppd->cntrs);
diff --git a/drivers/infiniband/hw/hfi1/init.c b/drivers/infiniband/hw/hfi1/init.c
index 4a11d4da4c92..bc2af709c111 100644
--- a/drivers/infiniband/hw/hfi1/init.c
+++ b/drivers/infiniband/hw/hfi1/init.c
@@ -839,7 +839,7 @@ static void stop_timers(struct hfi1_devdata *dd)
 
 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 		ppd = dd->pport + pidx;
-		if (ppd->led_override_timer.data) {
+		if (ppd->led_override_timer.function) {
 			del_timer_sync(&ppd->led_override_timer);
 			atomic_set(&ppd->led_override_timer_active, 0);
 		}
diff --git a/drivers/infiniband/hw/qib/qib_iba7220.c b/drivers/infiniband/hw/qib/qib_iba7220.c
index b1d512c7ff4b..22fd65fe7193 100644
--- a/drivers/infiniband/hw/qib/qib_iba7220.c
+++ b/drivers/infiniband/hw/qib/qib_iba7220.c
@@ -1662,7 +1662,7 @@ static void qib_7220_quiet_serdes(struct qib_pportdata *ppd)
 		       dd->control | QLOGIC_IB_C_FREEZEMODE);
 
 	ppd->cpspec->chase_end = 0;
-	if (ppd->cpspec->chase_timer.data) /* if initted */
+	if (ppd->cpspec->chase_timer.function) /* if initted */
 		del_timer_sync(&ppd->cpspec->chase_timer);
 
 	if (ppd->cpspec->ibsymdelta || ppd->cpspec->iblnkerrdelta ||
diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c
index bb2439fff8fa..471aaf6bcbf2 100644
--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -2531,7 +2531,7 @@ static void qib_7322_mini_quiet_serdes(struct qib_pportdata *ppd)
 		cancel_delayed_work_sync(&ppd->cpspec->ipg_work);
 
 	ppd->cpspec->chase_end = 0;
-	if (ppd->cpspec->chase_timer.data) /* if initted */
+	if (ppd->cpspec->chase_timer.function) /* if initted */
 		del_timer_sync(&ppd->cpspec->chase_timer);
 
 	/*
diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
index 6c16ba1107ba..66fb0318660b 100644
--- a/drivers/infiniband/hw/qib/qib_init.c
+++ b/drivers/infiniband/hw/qib/qib_init.c
@@ -815,23 +815,19 @@ static void qib_stop_timers(struct qib_devdata *dd)
 	struct qib_pportdata *ppd;
 	int pidx;
 
-	if (dd->stats_timer.data) {
+	if (dd->stats_timer.function)
 		del_timer_sync(&dd->stats_timer);
-		dd->stats_timer.data = 0;
-	}
-	if (dd->intrchk_timer.data) {
+	if (dd->intrchk_timer.function)
 		del_timer_sync(&dd->intrchk_timer);
-		dd->intrchk_timer.data = 0;
-	}
 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 		ppd = dd->pport + pidx;
-		if (ppd->hol_timer.data)
+		if (ppd->hol_timer.function)
 			del_timer_sync(&ppd->hol_timer);
-		if (ppd->led_override_timer.data) {
+		if (ppd->led_override_timer.function) {
 			del_timer_sync(&ppd->led_override_timer);
 			atomic_set(&ppd->led_override_timer_active, 0);
 		}
-		if (ppd->symerr_clear_timer.data)
+		if (ppd->symerr_clear_timer.function)
 			del_timer_sync(&ppd->symerr_clear_timer);
 	}
 }
diff --git a/drivers/infiniband/hw/qib/qib_mad.c b/drivers/infiniband/hw/qib/qib_mad.c
index f5a2aed31a89..37483f32935c 100644
--- a/drivers/infiniband/hw/qib/qib_mad.c
+++ b/drivers/infiniband/hw/qib/qib_mad.c
@@ -2496,7 +2496,7 @@ void qib_notify_free_mad_agent(struct rvt_dev_info *rdi, int port_idx)
 	struct qib_devdata *dd = container_of(ibdev,
 					      struct qib_devdata, verbs_dev);
 
-	if (dd->pport[port_idx].cong_stats.timer.data)
+	if (dd->pport[port_idx].cong_stats.timer.function)
 		del_timer_sync(&dd->pport[port_idx].cong_stats.timer);
 
 	if (dd->pport[port_idx].ibport_data.smi_ah)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 7e6842bd525c..a91fbbfc1b32 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -76,7 +76,7 @@ static void input_start_autorepeat(struct input_dev *dev, int code)
 {
 	if (test_bit(EV_REP, dev->evbit) &&
 	    dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
-	    dev->timer.data) {
+	    dev->timer.function) {
 		dev->repeat_key = code;
 		mod_timer(&dev->timer,
 			  jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
@@ -1790,7 +1790,7 @@ struct input_dev *input_allocate_device(void)
 		device_initialize(&dev->dev);
 		mutex_init(&dev->mutex);
 		spin_lock_init(&dev->event_lock);
-		init_timer(&dev->timer);
+		setup_timer(&dev->timer, NULL, (unsigned long)dev);
 		INIT_LIST_HEAD(&dev->h_list);
 		INIT_LIST_HEAD(&dev->node);
 
@@ -2053,7 +2053,6 @@ static void devm_input_device_unregister(struct device *dev, void *res)
  */
 void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
 {
-	dev->timer.data = (unsigned long) dev;
 	dev->timer.function = input_repeat_key;
 	dev->rep[REP_DELAY] = delay;
 	dev->rep[REP_PERIOD] = period;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 2db93d3f6d23..b9a4c1a6e4ba 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -11797,7 +11797,7 @@ static void i40e_remove(struct pci_dev *pdev)
 	/* no more scheduling of any task */
 	set_bit(__I40E_SUSPENDED, pf->state);
 	set_bit(__I40E_DOWN, pf->state);
-	if (pf->service_timer.data)
+	if (pf->service_timer.function)
 		del_timer_sync(&pf->service_timer);
 	if (pf->service_task.func)
 		cancel_work_sync(&pf->service_task);
-- 
2.7.4

Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data

[Dmitry Torokhov]

On Thu, Aug 31, 2017 at 4:29 PM, Kees Cook <keescook@chromium.org> wrote:
> In several places, .data is checked for initialization to gate early
> calls to del_timer_sync(). Checking for .function is equally valid, so
> switch to this in all callers.

Not seeing the rest of patches it is unclear from the patch
description why this is needed/wanted.

Thanks.

-- 
Dmitry

Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data

[Kees Cook]

On Thu, Aug 31, 2017 at 4:45 PM, Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> On Thu, Aug 31, 2017 at 4:29 PM, Kees Cook <keescook@chromium.org> wrote:
>> In several places, .data is checked for initialization to gate early
>> calls to del_timer_sync(). Checking for .function is equally valid, so
>> switch to this in all callers.
>
> Not seeing the rest of patches it is unclear from the patch
> description why this is needed/wanted.

The CC list would have been really giant, but here is the first patch
and the earlier series list:

https://lkml.org/lkml/2017/8/31/904
https://lkml.org/lkml/2017/8/30/760

tl;dr: We're going to switch all struct timer_list callbacks to get
the timer pointer as the argument instead of from the .data field.
This patch is one step in removing open-coded users of the .data
field.

-Kees

-- 
Kees Cook
Pixel Security

Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data

[Dmitry Torokhov]

On Thu, Aug 31, 2017 at 4:59 PM, Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> wrote:
> On Thu, Aug 31, 2017 at 4:45 PM, Dmitry Torokhov
> <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> On Thu, Aug 31, 2017 at 4:29 PM, Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> wrote:
>>> In several places, .data is checked for initialization to gate early
>>> calls to del_timer_sync(). Checking for .function is equally valid, so
>>> switch to this in all callers.
>>
>> Not seeing the rest of patches it is unclear from the patch
>> description why this is needed/wanted.
>
> The CC list would have been really giant, but here is the first patch
> and the earlier series list:
>
> https://lkml.org/lkml/2017/8/31/904
> https://lkml.org/lkml/2017/8/30/760
>
> tl;dr: We're going to switch all struct timer_list callbacks to get
> the timer pointer as the argument instead of from the .data field.
> This patch is one step in removing open-coded users of the .data
> field.
>

And that is exactly what should have been in the patch description.

FWIW for input bits:

Acked-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Thanks.

-- 
Dmitry
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Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data

[Jeff Kirsher]

[-- Attachment #1: Type: text/plain, Size: 1066 bytes --]

On Thu, 2017-08-31 at 16:29 -0700, Kees Cook wrote:
> In several places, .data is checked for initialization to gate early
> calls to del_timer_sync(). Checking for .function is equally valid,
> so
> switch to this in all callers.
> 
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Pavel Machek <pavel@ucw.cz>
> Cc: Len Brown <len.brown@intel.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
> Cc: Dennis Dalessandro <dennis.dalessandro@intel.com>
> Cc: Doug Ledford <dledford@redhat.com>
> Cc: Sean Hefty <sean.hefty@intel.com>
> Cc: Hal Rosenstock <hal.rosenstock@gmail.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> Cc: linux-pm@vger.kernel.org
> Cc: linux-rdma@vger.kernel.org
> Cc: linux-input@vger.kernel.org
> Cc: intel-wired-lan@lists.osuosl.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

For the changes to i40e...

Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data

[Rafael J. Wysocki]

On Friday, September 1, 2017 1:29:43 AM CEST Kees Cook wrote:
> In several places, .data is checked for initialization to gate early
> calls to del_timer_sync(). Checking for .function is equally valid, so
> switch to this in all callers.
> 
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Pavel Machek <pavel@ucw.cz>
> Cc: Len Brown <len.brown@intel.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
> Cc: Dennis Dalessandro <dennis.dalessandro@intel.com>
> Cc: Doug Ledford <dledford@redhat.com>
> Cc: Sean Hefty <sean.hefty@intel.com>
> Cc: Hal Rosenstock <hal.rosenstock@gmail.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> Cc: linux-pm@vger.kernel.org
> Cc: linux-rdma@vger.kernel.org
> Cc: linux-input@vger.kernel.org
> Cc: intel-wired-lan@lists.osuosl.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  drivers/base/power/wakeup.c                 |  3 +--
>  drivers/infiniband/hw/hfi1/chip.c           |  6 ++----
>  drivers/infiniband/hw/hfi1/init.c           |  2 +-
>  drivers/infiniband/hw/qib/qib_iba7220.c     |  2 +-
>  drivers/infiniband/hw/qib/qib_iba7322.c     |  2 +-
>  drivers/infiniband/hw/qib/qib_init.c        | 14 +++++---------
>  drivers/infiniband/hw/qib/qib_mad.c         |  2 +-
>  drivers/input/input.c                       |  5 ++---
>  drivers/net/ethernet/intel/i40e/i40e_main.c |  2 +-
>  9 files changed, 15 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
> index 144e6d8fafc8..79a3c1b204af 100644
> --- a/drivers/base/power/wakeup.c
> +++ b/drivers/base/power/wakeup.c
> @@ -479,8 +479,7 @@ static bool wakeup_source_not_registered(struct wakeup_source *ws)
>  	 * Use timer struct to check if the given source is initialized
>  	 * by wakeup_source_add.
>  	 */
> -	return ws->timer.function != pm_wakeup_timer_fn ||
> -		   ws->timer.data != (unsigned long)ws;
> +	return ws->timer.function != pm_wakeup_timer_fn;
>  }
>  
>  /*

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

for the above.

Thanks!